On the Special Pages → Special:ListUsers when was the last time an admin edited, and who was it?
Brandon Pierce is an admin of Battle Cats Wiki and the last time edited was 23:07, May 23, 2013

Any other information:

Other users, even admin and founder, left this wiki (some of them having trouble to update the game and some of them left because out of boredom) and everyday a lot of Wiki Contributors posting spam comments in the comments section of any page on the wiki and vandalizing, others users don't seem to edit and improve the wiki.

Unofficial response: (Please wait for an official response by a staff member)

Hello! There appears to be an active community at this wiki. You need to make a blog/forum post/announcement of some sort explaining your intentions to adopt the wiki, so others can give their input, and comment. It's best to make a blog or forum about your adoption than individual messages so there can be consensus in one place. You should let the announcement run for 1 week. If you do make a discussion, leave the link here so Staff can review it. Oh, and remember to continue to actively contribute why this request is processed (which will take 7-10 days). Good luck! Joey(talk)

Unofficial response: (Please wait for an official response by a staff member)